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确实好

Posted by bjiang at 2008-05-26 21:00:23 on Problem 2714
In Reply To:convex hull怎么做？ Posted by:frkstyc at 2006-03-06 21:47:14 
> 把所有的向量和和他们的相反按极角排序，然后枚举连续的n个，O(nlogn)
> 
相当不错的方法
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